QUESTION 21 Which of the following are foliated metamorphic rocks? (Select all t

Question

QUESTION 21

Which of the following are foliated metamorphic rocks? (Select all that apply.)

Schist

Marble

Gneiss

Slate

1 points   

QUESTION 22

What are the three main processes that form metamorphic rocks?

1) Changes in Temperature, 2) Seasonal Changes, and 3) Contact with Hot Fluids.

1) Changes in Environment, 2) Changes in Pressure, and 3) Contact with Hot Fluids.

1) Changes in Temperature, 2) Changes in Environment, and 3) Seasonal Changes.

1) Changes in Temperature, 2) Changes in Pressure, and 3) Contact with Hot Fluids.

1 points   

QUESTION 23

Neomorphism occurs when small minerals of one mineral slowly convert to larger (and fewer) crystals of the same mineral.

True

False

1 points   

QUESTION 24

Stretched and sheared grains, veins, folds, and lineations can only occur in foliated metamorphic rocks.

True

False

1 points   

QUESTION 25

________ occurs when an extraterrestrial object crashes onto the surface of the Earth and alters the surrounding rock due to extreme pressure conditions.

Dynamic Metamorphism

Shock Metamorphism

Regional Metamorphism

Burial Metamorphism

Schist

Marble

Gneiss

Slate

Explanation / Answer

21] Schist, Genisis and Slate

Foliated metamorphic rocks such as gneiss, phyllite,schist, and slate have a layered or banded appearance that is produced by exposure to heat and directed pressure.

22] option d is correct

There are three main processes that can create metamorphic rock:

- High heat and pressure due to the rock being deep below the Earth's surface

- Friction and distortion created by tectonic plate movements

- Intrusion of magma which subjects the rock to high heat

23] False

Recrystallisation occurs when small minerals of one mineral slowly convert to larger (and fewer) crystals of the same mineral not neomorphism.

24] True

Slate, schist, and gneiss are three common foliated metamorphic rocks. Slate is a hard, fine-grained rock with a well-developed rock cleavage or slaty cleavage caused by the incipient growth of platy (micaceous) minerals, due to metamorphism of fine-grained clastic sediments such as shale and siltstone and also volcanic tuffs.  Schist is a still higher degree of metamorphism, characterized by coarse grained foliation and/or lineation, with mica crystals large enough to be easily identified with the unaided eye.  Gneiss is a medium to coarse-grained, irregularly banded rock with only poorly developed cleavage.

25] Shock metamorphism

Shock metamorphism, also called impact metamorphism, occurs when high heat and pressures generated during an impact deform the underlying rock layers.It can lead to planar deformation features, high-pressure polymorphs, and shatter cones, all of which provide evidence supporting a bolide impact.

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